Tilde Diaeresis is a Monadic operator with a Dyadic operand
Operator Tilde Diaeresis means
2 ⍴ 3 ⍝ ⍺ ⍴ ⍵ 3 3 2 ⍴⍨ 3 ⍝ ⍵ ⍴ ⍺ 2 2 2 ⍴⍨ 3 ⍝ ⍵ ⍴ ⍵ 3 3 3
'mu'⍨ 'any' ⎕NULL ⍝ Always returns its operand mu 1E100 ('mu'⍨) 1j1 mu ¯1⍨¨ ⍳2 3 ¯1 ¯1 ¯1 ¯1 ¯1 ¯1
2 ⍴ 3 ⍝ ⍺ ⍴ ⍵ 3 3 2 ⍴⍨ 3 ⍝ ⍵ ⍴ ⍺ 2 2 2 ⍴⍨ 3 ⍝ ⍵ ⍴ ⍵ 3 3 3
'mu'⍨ 'any' ⎕NULL ⍝ Always returns its operand mu 1E100 ('mu'⍨) 1j1 mu ¯1⍨¨ ⍳2 3 ¯1 ¯1 ¯1 ¯1 ¯1 ¯1